Solar measuring machine, 1860
{"Image ImageDescription": "Solar measuring machine, 1860. Engraving showing an heliograph instrument being used to measure the total solar eclipse on 18th July 1860.", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image YCbCrPositioning": "Centered", "Image Copyright": "Science Photo Library"}